TikTok New Grad Machine Learning Engineer interview questions

Recruiter reach out to me on Linkedin, and I have the first interview doing one leetcode question (easy-medium) and some basic ML questions. Second round more in depth ML questions + 2 more leetcode (medium + hard). Got rejected after the second round

The interviewer expected me to know extensive technical details of a specific stage of a machine learning pipeline that their team is using, which I learned at school, but I did not have a thorough hands-on experience as a new grad. The interviewer then turned out to be very unresponsive till the end of the interview, which I think was a clear signal of rejection, but was disturbing.